Wondrous item, very rare
These old boots are always a bit too big for their wearer. If they are put on at the end of a long rest and worn continuously until the next long rest, they can be used to cast Magnificient Mansion once per day. The entry to the mansion is located between the two boots which act as mystical doorposts of sorts and cannot be moved for the duration of the spell. The floorplan of the mansion is reminiscient of the interior of a boot. The spell ends prematurely when the boots are put on again.